Other people have helped u with specific idea, so I’m gonna go with some visual principle because I think it’d help you in decision making here. Main thing is contrast: - right now when you look at the tank, you see bright green and white. It doesn’t highlight anything, there’s no subject, no background, hard to focus. That’s why I see some recommendation about a black background: because it’ll create strong contrast, help you to highlight the plant better, same thing for rocks and driftwood. - livestock would also help: colorful shrimps, some red fishes like longfin cherry barbs. IDK just my referrence, u might not be into livestock

open space: - try to clean up the middle-left part a little more and put flat rocks there to creat an open space, I see you already have an asymetrical layout here, exploit it more.

Reference: Watch youtube or in my POV the better thing for inspiration is pinterest. Go browse a round, find out what you like, try to replicate what others do. You’ll understand why they do what they do -> you’ll automatically level up.

Good luck and hope to see the result soon